*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Josefin Sans', sans-serif;
}

header{
    width: 100%;
    height: 100vh;
    background-image: linear-gradient(rgba(0,0,0,0.3),rgba(0,0,0,0.1)), url(planet-earth.jpg);
    background-repeat: no-repeat;
    background-size: cover;
}

/* Style for Nav bar */
nav{
    width: 100%;
    height: 15vh;
    background: rgba(0,0,0,0.3);
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
    text-transform: uppercase;
} 

/* Style for Nav bar ( <div class="logo"> )  */
nav .logo{
    width: 25%;
    text-align: center;
}

/* Style for Nav bar ( <div class="menu"> ) */
nav .menu{
    width: 40%;
    display: flex;
    justify-content: space-around;
    
}

/* Style for Nav bar ( for anchor tags ) */
nav .menu a {
    width: 25%;
    text-decoration: none;
    color: white;
    font-weight: bold;
}

nav .menu a:first-child{
    color: #00b894 ;
}

/* -- through this the content will come in center -- */
main{
    width: 100%;
    height: 84vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
}

/* -- here designing the h3 of section -- */
section h3{
    font-size: 35px;
    font-weight: 200;
    letter-spacing: 3px;
    text-shadow: 1px 1px 2px black;
}

/* -- here designing the h1 of section -- */
section h1{
    margin: 30px 0 20px 0;
    font-size: 55px;
    font-weight: 700;
    text-shadow: 2px 1px 5px black;
    text-transform: uppercase;
}

/* -- here designing the "p" of section -- */
section p{
    font-size: 27px;
    word-spacing: 2px;
    margin-bottom: 25px;
    text-shadow: 2px 2px 2px black;
}

/* -- here designing the "p" of section -- */
section a{
    padding: 12px 30px;
    border-radius: 4px;
    outline: none;
    text-transform: uppercase;
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    letter-spacing: 1px;
    transition: all .5s ease;
}

/* -- class inside the section (designing the button one ) */
section .btnone{
    background: #00b894;
    color: white;
}
.btnone:hover{
    background: #fff;
    color: #000;
}

/* designing the button two */
section .btntwo{
    background: #fff;
    color: #000;
}
.btntwo:hover{
    background: #00b894;
    color: white;
}


.change_content::after{
    content: '';
    animation: changetext 12s infinite linear;
    color: #00b894;
}

@keyframes changetext {
    0%{content: "Giza Pyramids";}
    20%{content: "Great Wall of China";}
    35%{content: "Taj Mahal";}
    50%{content: "Colosseum";}
    70%{content: "Chichén Itzá";}
    90%{content: "Machu Picchu";}
    100%{content: "Petra";}
    
}